Remove OwnPtr from Blink.

third_party/WebKit/Source/modules/filesystem/FileWriterBase.h

Index: third_party/WebKit/Source/modules/filesystem/FileWriterBase.h
diff --git a/third_party/WebKit/Source/modules/filesystem/FileWriterBase.h b/third_party/WebKit/Source/modules/filesystem/FileWriterBase.h
index 89d97d98121bc0ea996a5dda9d1c8f5923a9c6cf..dcace75a019511a5283ee51e8b38857643dbddfc 100644
--- a/third_party/WebKit/Source/modules/filesystem/FileWriterBase.h
+++ b/third_party/WebKit/Source/modules/filesystem/FileWriterBase.h
@@ -32,8 +32,7 @@
 #define FileWriterBase_h
 
 #include "platform/heap/Handle.h"
-#include "wtf/OwnPtr.h"
-#include "wtf/PassOwnPtr.h"
+#include <memory>
 
 namespace blink {
 
@@ -42,7 +41,7 @@ class WebFileWriter;
 class FileWriterBase : public GarbageCollectedMixin {
 public:
     virtual ~FileWriterBase();
-    void initialize(PassOwnPtr<WebFileWriter>, long long length);
+    void initialize(std::unique_ptr<WebFileWriter>, long long length);
 
     long long position() const
     {
@@ -76,7 +75,7 @@ protected:
     void seekInternal(long long position);
 
 private:
-    OwnPtr<WebFileWriter> m_writer;
+    std::unique_ptr<WebFileWriter> m_writer;
     long long m_position;
     long long m_length;
 };